Decided to not pre-heat mash tun. My HLT was 164F, MT was 159F before grain. mash was 149 but then went to 150, perfect. MT stays warm next to HLT
Based on boiling 8.70 gallonsliters at 1.054 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.060. You wanted an OG of 1.061. It looks like it will be under.